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chromeos::TabletState is the singleton that actually holds the
information about the current TabletMode state. The state getter
method is public, but its setter is not. The idea is that only a
handful of classes can actually set the state, eg
ash::TabletModeController.

In the future, Lacros will also be able to create a
chromeos::TabletState instance and set the tablet mode state
via the (upcoming) use of `zcr_remote_shell` Exo protocol extension.

BUG=1113900
R=jamescook@chromium.org

Change-Id: I2ec77e7f038095b7e4f9c776683993f6b30c409e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443219
Commit-Queue: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813394}